Sears offers the Serta Nolan II Pillowtop Queen Mattress, model no. 703263-350, for $249.99. Coupon code "SEARS5OFF50" cuts it to $244.99. With $69.99 for shipping, that's tied with our August mention, $380 off list, and the lowest total price we could find.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.